Spinning arrangement



June 22, 1 937. H. e. VAN DER WAALS 2,084,929

SPINNING ARRANGEMENT Filed May 17, 1955 3nnentor.

van (Yer Mala Patented June 22, 1937 PATENT OFFICE SPINNING ARRANGEMENT Hendrik Gerardus van der Waals, Arnhem,

Netherlands, assignor to American Enka Corporation, Enka, N. 0., a corporation of Delaware Application May 17, 1935, Serial No. 22,095 In the Netherlands May 24, 1934 3 Claims.

This invention relates to a spinning arrangement for the production of artificial filaments, especially artificial silk threads according to the wet spinning-method and has primarily for its 5 object means for eliminating unevenness of dyeing and especially the so-called flame efiect.

Another object of my present invention lies in providing an improved roller means over which the green thread passes, which roller means is adapted to move laterally and so to equalize the differences in tension effected by the to-and-fro motion of the reciprocating thread guide.

It is a further object of the invention to provide means for increasing the length of the thread between the take-up spool and the last fixed point from which the thread is passed onto the said spool.

These and other objects of my present invention will in part be pointed out and in part become obvious from a study of the following description and by reference to the drawing attached.

The figure shows a schematic view of the spinning arrangement.

In the production of artificial filaments, especially artificial silk, in the wet spinning process, the influence of the reciprocating thread guide which regulates the winding and distribution of the thread on the spinning-spool is highly unfavorable as far as the dyeing properties of the product are concerned, because the thread-guide in its outer positions on the edges of the spinningspool causes a much greater stretching of the thread than it does in the middle position. This brings forth, as is well known, a periodic variation in the physical properties of the thread, and as a further consequence, an unevenness in dyeing. The difiiculties in dyeing which arise in this way are known in weaving under the names of zebraor flame-effect. The extent in the variation of the degree of stretching depends upon a number of factors, some of the most important of which have to do simply with the geometric nature of the arrangement, namely the length of the spinning-spool or yarn-winder which is to be wound up and the distance from the middle-point of the place where the winding is done to the last fixed point from which the thread is lead onto the take-up spool. If the thread comes directly from the nozzle through the reciprocating thread guide to the winding spool, then the last fixed point is the nozzle with the spinning-holes, and the variations in colour are less, the more the nozzle (i. e. the last fixed point) is distanced from the winding spool,

(Cl. l88) and more pronounced, the nearer the nozzle or the last fixed point is to the spool, because in the latter case, the distance between the fixed point and the outer edge of the Winding spool is considerably large compared with the distance between the fixed point and the middle position on the spool. The conditions are not materially different when the thread which is spun in the spinning bath, instead of going directly to the winding spool, is first led over deviating rollers or over thread guides. In such a case, the last fixed point is the last fixed deviating roller or the last fixed thread guide, and it is then from this point onward that the geometric conditions are to be considered. It is because of these as well as other considerations that one has always strived to make the distance between the last fixed point and the winding spool just as great as possible. But because of lack of space it is very often impracticable to arrange such long thread distances.

Referring now to the drawing I will describe in the following means for the purpose of accommodating long thread lengths even in relatively confined space conditions, and nevertheless enabling the last fixed point to be located at a considerable distance from the winding spool.

The artificial silk thread 3 which issues from the nozzle l in the spinning bath 2 is led directly or indirectly to the mechanically driven godet wheel 4. From there on, the thread is passed over the deviating roller 5 and over the reciprocating thread guide 6 to the actual winding spool 7. The deviating roller 5 is supported on an axis which is parallel to that of the actual winding spool 'l'. The deviating roller 5 is not only free to rotate, but is also free to move laterally on its axis, so that it can move back and forth without any hindrances, thereby permitting it to respond to the lateral impulses originating from the reciprocating thread guide and transmitted to the roller by the thread passing over it. Because this special guiding roller 5 has the possibility of motion in a lateral direction the last fixed point of the thread which is being drawn on to the winding spool is transferred from the spool 5 back to the spool 4, so that the entire length of thread from the spool 4 over the spool 5 to the winding spool 1 becomes free for unhindered lateral motion.

Having now set forth my invention what I claim is:

1. An apparatus for spinning artificial silk thread and the like comprising a spinneret, a

thread and the like comprisingta spinneret, a bob bin for collecting the thread, a draw-off roller in the path of travel of the thread, a traversing thread guide for laying the thread upon the bobbin and a roller thread guide in advance of the traversing guide mounted for free lateral and rotary movement in accordance with the move ment of the advanced portion of the thread as effected by the traversing guide.

3. An apparatus for spinning artificial silk thread and the like comprising in combination a spinneret, a bobbin for collecting the thread, a driven godet wheel in the path of travel of the thread, a transversely reciprocating thread guide adjacent the bobbin for distributing the thread thereon and a roller type thread guide located between thevgodet wheel and the bobbin and mounted for free lateral movement in accordance with the movement of the thread as effected by the reciprocating guide. V

HENDRIK GERARDUS VAN DER WAALS. 

